Lambda the Ultimate

Accounts spamming many stories with posts containing exactly the same URLs, such as the recent Yeezy shoes spam, are very easy to filter. Is this really so hard to do with the current Drupal set-up?

Steve Kemp has an XML-RPC-based, centralised comment spam detection service that works very well for the Debian sites. Could that be used here?

Cf. old discussions on dealing with spam?, which has Ehud's objection to filters; and SPAM reports, which describes the Anton spam-monitoring daemon. It's been a year since the last site discussion topic dealing with spam, so the topic might be due for revisiting.